well, I'll just reply my experience here but I know they are multiple threads on this topic :)

I had my phone for a full week now.
Battery life really got me scared at first!!! had unexplainable drains

I did a 2 full discharges where one really had the phone shutdown.
and now I get great timings!
BUT
I had issues with SKYPE notifications. (didn't get them anymore) and so I uninstalled SKYPE. Now I have great battery life!

SO again I blame the drain on SKYPE and also probably because after 1 week I've trained the battery a bit

here's a phone after a full discharge

phone today after nightly charge and full day on battery. OK I admit had only a few calls and a minimum of surfing

I'm sure there are days when drain will be heavier... but when I don't use my often, I would expect to come home with a phone at least still 50% charged.

so my advice is if you experience drain, try disabling apps that run in background or apps that are setup to receive notifications. It could very well be one of these. Don't blame the phone directly, nor the OS running it

Got new replacement Lumia 920 three days ago and I have to say that battery life of this phone is way better than the one before. Old one was constantly rebooting and thats why I got new phone (at first they just updated the Portico, but that didn't help).

But anyways, its now 48h since last overnight charge and I have still 36% left. Haven't been using the phone too much, few calls, sms, just 20 photos, some playing ja little www. I also downloaded few countries to Nokia Drive. I don't have e-mail yet, but otherwise I have everything ON (bt, wlan, location, NFC)

So I am very pleased for this one. Previous phone took approx. 1% battery in 1h standby (when nfc, bt, wlan etc. off). This phone takes less than that with everything on.

So im getting really bad battery life? I listen to music, tweet a bit, use flux reader for around 15-20 mins. And WhatsApp. Barely any calls. And the battery goes into battery saver by 12. Removed it from a full charge at 730 am.

The batterylife on the Lumia 920 is AMAZING!! I normally get 2+ days without charging it, even with listining to music, surfing, playing games, using the camera and sending texts :)
My old Nokia N9 only had a batterylife of 12 hours even with a smaller usage than I do with the L920!

But my N9 has a much more restistant screen than my Lumia... Sad.. Sad...

So im getting really bad battery life? I listen to music, tweet a bit, use flux reader for around 15-20 mins. And WhatsApp. Barely any calls. And the battery goes into battery saver by 12. Removed it from a full charge at 730 am.

Mix of 3g and 2g

Maybe the mix of 3G and 2G is the reason. Try to set it 2G only and see what happens.

Do you listen via Nokia Mix Radio? If so, then streaming music eats battery. And I assume that if you have bad 3G and it switches between 2G and 3G all the time make it worse.

The batterylife on the Lumia 920 is AMAZING!! I normally get 2+ days without charging it, even with listining to music, surfing, playing games, using the camera and sending texts :)
My old Nokia N9 only had a batterylife of 12 hours even with a smaller usage than I do with the L920!

But my N9 has a much more restistant screen than my Lumia... Sad.. Sad...

Is your mobile network set to maximum connection speed as 3G or 4G ? ... or do you keep it 2G and change when needed ? ... how about wi-fi ? - on, always on or off and changed when needed ?

By the way, I am old N9 user too and I still have it ... but Lumia 920 hardware is clearly better ... :)

Is your mobile network set to maximum connection speed as 3G or 4G ? ... or do you keep it 2G and change when needed ? ... how about wi-fi ? - on, always on or off and changed when needed ?

By the way, I am old N9 user too and I still have it ... but Lumia 920 hardware is clearly better ... :)

I put mine on max. 3G :) and only 4G, if I need to download huge sized files my laptop :p
Wi-fi is only on when I have to download a game / app over 50 mb, but else it's off most of the time, because I only have a internet connection of 256 kbit at home, and up to 70 mbit on my phone :p
And I normally charge it at 10 - 13%, and sometimes earlier if I'm not sure if I need to use it a lot :)

The batterylife on the Lumia 920 is AMAZING!! I normally get 2+ days without charging it, even with listining to music, surfing, playing games, using the camera and sending texts :)

Yeah same goes for me :) I´ve had the phone now for about 2 weeks andn all I can say is wow about the batterylife.
My Lumia 920, with the portico update, litterally Never goes below 36hours of usage and usually it lasts about 2+ days with MY everyday usage.
Before I had the HTC desire HD so its the only phone I can compare to. When using both phones on a daily basis and doing the SAME amount of things on them (well, only exception is turning on LTE/4G on my Lumia, which uses "more" battery" than 3G, but even then, theres no remarkable difference that I noticed), my HTC dhd battery lasts for approx 1 day and my Lumia 2+ days.

My daily usage - about 1h phonecalls, 1h gaming, checking/writing my msg/mails/facebook 30 times, surfing (usually wifi because I only need to turn on the 4G when on the go somewhere), not so much music though and maybe snapping 3-4 pics every day.

10-15 hours with moderate to heavy use for me. (Whatsapp, sms, twitter, skype, browsing, listening to music for 30 mins). Plus, I found out that using a static photo on the lock screen boosts battery life on standby greatly!

My battery life is so sporadic. Now granted I don't use it the same amount each and everyday but generally speaking, you'd think there would be some kind of pattern. About half the time the phone is completely dead on its face by 4 or 5pm. The other half, i'll have 60% and 1day of life left at 10pm when i go to bed.

I'm currently at 41% and 1 day and 20 hours since my last charge. I've probably played games a total of 3-4 hours on this charge, although not the most graphically intense of games. About 1-2 hours worth of various apps and browsing. Took a few photos. Some Skydrive use and email and texting.

Battery life has been great for quite some time now. My other Lumia 920 with the broken screen has been in airplane mode for weeks without needing to be recharged.

My battery life used to be pretty poor, but it has improved after I started leaving it on the charger at 100% for ~30 minutes and turning off wifi when it's not in use. My phone has been off the charger since 6 AM, it's now 3:50 PM and I'm at 85%. This isn't amazing battery life, but it is pretty good considering moderate usage. It's also a big improvement on how my battery life used to be! Overall, I'm finally satisfied with the battery life on my phone.

I typically get around 35-40 hours of normal usage before the battery drains completely. There are some random days (once a month or so) when the battery drains much quicker. A reboot seems to fix the issue and hopefully the next round of updates will iron out these discrepancies. Here is a screenshot from a week ago :-).